Glest is fully modable, though when players refer to a mod, they generally mean a faction or techtree. A techtree is a full set of factions with their own resources, damage types, etc. You can only use factions that all belong to the same tech tree in a game (eg: Magitech). A faction is the team of units that a player can control, and defines the units, upgrades, how they work, etc (eg: Tech). Installing Mods varies based on the type of mod and engine, and mods can utilize engine specific content. For example, Military uses GAE only functions such as guarding and emanations. This page is just a list of all Techtrees, Factions, and Mod Compilations (which include at least one faction). All mods here are sorted alphabetically, and not based on merit or opinions.